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Fractionation for Resolution of Soluble and Insoluble Huntingtin Species
Published on: February 27, 2018
The diagnosis of Huntington's disease by different molecular tools: a systematic review
Tiago César Gouvêa Moreira1,2, Carmen Lucia Antão Paiva1,3, Luciana Andrade Agostinho1,4
1PPGNEURO (Programa de Pós-Graduação em Neurologia), Hospital Huniversitário Gaffrée e Guinle, Rua Mariz e Barros, Rio de Janeiro, Brazil.
Insights
Molecular diagnostic tools for Huntington's disease (HD) show varied validation. Thorough assessment of key parameters like sensitivity and specificity is crucial for accurate HD diagnosis and patient management.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Huntington's disease (HD) is a fatal neurodegenerative disorder caused by CAG trinucleotide repeat expansion in the HTT gene.
- Accurate molecular diagnostic tools are essential for early detection, genetic counseling, and clinical management of HD.
- Current diagnostic methods for HD exhibit variability in their validation, potentially impacting reliability.
Purpose of the Study:
- To review and analyze the validation methods of molecular diagnostic tools for Huntington's disease.
- To identify the strengths and weaknesses of different molecular diagnostic techniques for HD.
- To highlight the need for standardized validation protocols in HD molecular diagnostics.
Main Methods:
- A systematic literature search was conducted using PubMed with keywords related to Huntington's disease and molecular diagnostic techniques.
- The review adhered to PRISMA guidelines, and bias assessment followed Cochrane Handbook recommendations.
- Nineteen articles presenting validation methods for HD molecular diagnostics were included in the analysis.
Main Results:
- Significant variability was observed in the validation methods employed across the reviewed studies.
- Only three studies reported comprehensive validation parameters including limits of detection, reproducibility, sensitivity, and specificity.
- TPPCR coupled with capillary electrophoresis demonstrated high accuracy, while gel electrophoresis-based methods showed lower sensitivity and specificity.
Conclusions:
- The lack of standardized validation for molecular diagnostic tools in Huntington's disease can compromise diagnostic accuracy.
- Thorough validation, including assessment of sensitivity and specificity, is critical for reliable HD diagnosis.
- Improved standardization of validation methods will enhance genetic counseling and clinical management of Huntington's disease.
Background:
Huntington's disease (HD) is a neurodegenerative condition resulting from CAG trinucleotide expansion in the HTT. We reviewed various molecular tools for diagnosing HD and their respective validations and outlined their advantages and disadvantages.
Methods:
We utilized PubMed, employing Huntington's disease OR chorea AND Molecular Diagnosis OR Molecular Diagnostic Techniques as keywords. This review was submitted to the PROSPERO platform (nºCRD42021253951). The PRISMA checklist was used, and bias assessment followed the guidelines outlined in the Cochrane Handbook for Systematic Reviews of Diagnostic Test Accuracy.
Results:
845 articles were retrieved, 17 were selected for full-text review, and two additional articles were manually included, resulting in 19 that presented the validation method: only three studies reported the limits of detection, reproducibility, sensitivity, and specificity, which are essential for validating these techniques, given the unstable nature of CAG regions; six calculated at least one of these parameters, and 10 did none.
Conclusion:
We identified significant variability in the validation methods with only three thoroughly assessing the key validation parameters. The lack of standardized validation approaches may compromise diagnostic accuracy, impacting genetic counseling and clinical management. TPPCR coupled with capillary electrophoresis, demonstrated high accuracy, whereas gel electrophoresis-based methods exhibited lower sensitivity and specificity.
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